Automatic wire de-spooler for wire bonding machines

Details Automatic wire de-spooler for wire bonding machines Automatic wire de-spooler for wire bonding machines

1992-08-25

1994-06-07

Jillions, John M.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

B65H 5904

Patent

active

053182340

ABSTRACT:
A de-spooler apparatus for paying out fine wire from a spool of wire, for use in wire bonding machines, maintains a relatively constant slack length of wire within the apparatus, thereby allowing wire to be drawn from the machine as needed with a minimum amount of tension exerted on the wire. The apparatus includes a spool drive motor for paying out wire from a spool, a hairpin-shaped bail for containing a slack length of wire, and a nozzle for directing a stream of pressurized gas downwards into the open end of the bail, causing wire within the bail to form a curved slack length. The apparatus also includes a proximity-type feed sensor for detecting when the slack length straightens and shortens a pre-determined amount, bringing the slack length into the detection range of the feed sensor, which outputs an electrical signal that causes the drive motor to rotate in a forward sense, paying off wire from the supply spool and increasing the slack length. The preferred embodiment also includes an end-of-spool sensor for producing a status signal indicating that nearly all of the wire on a spool has been paid out.

REFERENCES:
patent: 4019669 (1977-04-01), Tanimoto et al.
patent: 4498638 (1985-02-01), Kurtz et al.
patent: 4530471 (1985-07-01), Inoue
patent: 4763826 (1988-08-01), Kulicke et al.
patent: 4899945 (1990-02-01), Jones
patent: 4909431 (1990-03-01), Japichino et al.
patent: 5137223 (1992-08-01), Brandon et al.

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